Achievement unlocked ! Add achievement to Alien Blitz

Added some references to games/movies, I had some ideas for a long time, and I finally implemented some

Corrected some bugs

I’ve added 86 achievements to the game, I didn’t want them to be too simple, there are some that you will necessarily get, but most of them are at least a bit hard. You get money when getting an achievement. All achievements are not yet possible to get, some are specific to episode 2 or 3. I will add more later, mainly for some game references.